2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 16, 599-601 (2003)
DOI: 10.1140/epja/i2002-10128-3

UCN production in superfluid helium

W. Schott1, J.M. Pendlebury2, I. Altarev1, S. Gröger1, E. Gutsmiedl1, F.J. Hartmann1, S. Paul1, G. Petzoldt1, P. Schmidt-Wellenburg1 and U. Trinks1

1  Physik-Department E18, TU- München, D-85747 Garching, Germany
2  School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton, Sussex, BNI 9QJ, UK

wschott@e18.physik.tu-muenchen.de

(Received: 28 March 2002 / Revised version: 11 November 2002 / Published online: 11 March 2003)

Abstract
Ultra-cold neutrons (UCN) are produced in superfluid helium by single- and multi-phonon excitation. The UCN production rate density $R_{\rm II}$ via multiphonons can be larger than that by one-phonon excitation $R_{\rm I}$ being due to the dependence of the incident neutron spectral flux density $\drm \phi/\drm \lambda$ on the wavelength $\lambda$.

PACS
78.70.Nx - Neutron inelastic scattering.
67.20.+k - Quantum effects on the structure and dynamics of nondegenerate fluids (e.g., normal phase liquid $\chem{^{4}He}$).
61.12.Ex - Neutron scattering techniques (including small-angle scattering).
29.25.Dz - Neutron sources.

© Società Italiana di Fisica, Springer-Verlag 2003